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The coefficient of performance of a refrigerator is defined as the ratio of heat extracted from the refrigeration compartment to the work required to operate the refrigerator. A certain refrigerator has a coefficient of performance of 2 and requires 571 W of electrical power to operate its compressor. At what rate will this refrigerator deliver heat to the room in which it is operating when it is running?
A small 1.85-GBq 198Au source (maximum beta-particle energy0.961 MeV, average 0.315 MeV) is enclosed in a lead shield justthick enough to absorb all the beta particles. a) Estimate the energy ?uence rate due to bremsstrahlung ata point 50 cm away.
A circuit consists of a 9.0-V battery connected to three resistors (37 ?, 17 ?, and 150 ?) in series. Find the current that flows through the battery
A force platform is a tool used to analyze the performance of athletes measuring the vertical force that the athlete exerts on the ground as a function of time. With what speed did she reach the platform
Suppose wire A and wire B are made of different metals, and are subjected to the same electric field in two different circuits. How many electrons enter wire B every second
In the figure below, block 1 of mass m1 slides from rest along a frictionless ramp from height h = 2.30 m and then collides with stationary block 2, which has mass m2 = 2.00m1. What is the value of distance d if the collision is elastic
At the time this problem was written, the price of gold was $411 per ounce, while that of platinum was $884 an ounce, How much would a platinum nugget of this size be worth
A current of 2.45 A flows along the length of a long solid cylindrical conductor. The radius of the cylinder is 8.5 cm. The current is uniformly distributed through the conductor. Calculate the magnitude of the magnetic field 2.4 cm from the cente..
A brass rod with a length of 1.40m and a cross-sectional area of 2.37cm2 is fastened end to end to a nickel rod with length L and cross-sectional area 0.720cm2, What is the strain in the nickel rod
A football is punted straight up into the air; it hits the ground 5.2 s later. With what speed did it leave the kicker's foot
A muon and an antimuon are moving in opposite directions with velocities of -0.4 c and 0.4 c, respectively. What is the wavelength of each photon
An electron in the beam of a typical television picture tube is accelerated through a potential difference of 20,000 V before it strikes the face of the tube, what is the eneregy of the electron in joules
If a disk rotating at 10 rad/s has a moment of inertia of 0.5 kg m^2. Then another disk with a total mass of 5 kg, What is the angular speed of the new system in units of rad/s
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